Display screen or a portion thereof with graphical user interface



The FIGURE is a front view of a display screen or a portion thereof with a graphical user interface.

The dash-dot broken lines showing a display screen or portion thereof and the broken lines showing elements of the graphical user interface illustrate portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a display screen or a portion thereof with a graphical user interface, as shown and described. 